Press for drawing sheet metal



Sept. 25, 1928. g 1,685,308

. G. w. BERRY PRESS FOR DRAWING SHEET METAL Filed March 19, 1925 3 Sheets-Sheet. 3

Patented sept. 25, 192s.

unire srAiEs PAI-M Fm. f

GEORGE WILLIAM BERRY, 0E LEEDS, ENGLAND, AssiGNoR or ONE-HALE r.ro CHARLES Y Y v JOSEPH RHODES,z 0E wAKEEiELD, ENGLAND.

rREss FOR rDRAWING SHEET METAL. y

operations, such presses having cooperating movable and stationary dies the stationary die comprising inner and outer drawing members each supported as by pressure pins and under theaction of separate cams by which the pressure and timing of operation of the respective pressure members are con-y trolled.

The objectof the'r'invention is to provide means for taking the rstdraw pressure` or relieving the redraw7 cam of pressure 'dury ing the first drawina operation, so that no tendency is present or the vmechanism to be thrown out of proper action kdue to oblique forces acting on intervening parts, such vas A the roller on which the redrawcam Operates,

up to the time the redraw member com-`I mences its function or descent.V

.The invention thereforev comprises means for transmitting the pressure-'of the first draw to the bed orequivalent of the press by obstructing the movement of one of the Idrawing members through which said pressure is exerted and then subsequently removling the obstruction prior to the operation of said'dr'awing member.` 'l 'n The invention also comprises other details of construction, arrangenientY and combination of parts asset forthv inthe appended claimsand specied in the following description with reference to the accompanying drawings in which: Y

Fig..1 is'avertical section of a press Of the'type described to which the present invention has been applied; Fig. 2 is ayvertical section at right angles to Fig. lvwith'certain parts removed and Fig. 3 is a crosssection Von line 3-43 of Fig. l. The said drawings illustrate 4at a the bed of the press support- 'ing the lower die b which comprises the outer drawing member b1 yand l,the inner or, redraw member 62, these members being supported respectively by pressure, pins b3 b4 with whCh are assocatedrespectively buffers 0,1 c2. Vcl Ydesignates the ramlor cross Yhead carrying the upper die. di*u Y Application mea Maren 19, i925, seriaiNo. 16,670, aneinereat Britain May er, 1924.5

There arey connectedto the ram* d tie rods.V`

e which extend through the bed a ofthe.

press and are connected belowl to frames 76 which carry aY cam shaft 701', theilatter having mounted thereonv one near each' end a" pinion` 7c3 which vmeshes with a krack 702 carried by the' press frame cfone at each 'side thereof. On the tie rods e is slidably` mounted a table Z supporting the buffer 'C1' associated ywith the outer or main drawing Ymember 1. l

engages two operating or first draw cams m This' table orbuer support Z` looselymounted on' the'cam 'shaft k1 thev table being providedwith rollers la? vor otherV antifriction means carried by brackets k6 on Y the table for 'engagement with vthe cams m.

:There isalsoprovided at or about the centre of the Vtable a redraw spindle n `extending through the kbuffer '01lv andassociated parts and acting on the secondbuer C2 pertainingitothe inner or redrawimem A,

connected as by screw n? with a` slide or the like n2 guided in guides u? below. the table Zand co.operating with another cam bei' Z22, said redraw spindlebeing adjustably 'm1 onfthe cam shaft/lc1 which maybe 'termed they redraw cam.

The aforesaid pinions 7c3 are to thefirst draw cams/m and all the cams anchored oscillate` on the camshaft the latter how-V ever not oscillating butbeing caused to rise 'and fall' through tie rods e with thejinove- Vments ofthe ram. Thi'scam control mech-V anism isthe y,same as that' employed inthe press" disclosed in my prior Patent kNo. 1,561,902 issued November 1,7, 1925. v v

There are attachedto the tie rods etat each vsideof thel press by which thecam' i 'mechanism'fis operated fromthe ram d as above described cross members orbar's" e1 which carry vertical'bars f1, in the nature of cam members, adapted to yoperate slides -workingwinvguides f2 inthe'bed a laterally 'i into, andout vof theV of movementof the supporting pins o4 for the drawing memberbz.A The said slides aresuitably formed oftwo relatively adjustable parts g, g1, con-A I nected; as'by screw and,l slot connectionsv g2..

as an abutmentforen'gagement of the resi sure pins Z1? supportingjthe innerer re raw They pass under the'lower die b andl serveioe member b2, said pins being shown as ren duced in diameter to form shoulders b for this purpose.

The slide actuating'cam bars f f1 passthrough slots f3 in the slides, these slots having inclined faceslh tl acted on-Y by wedge members z' 1, on the bars, so that the slides are inserted under and -Withdrawn from the pressure pins b4 at the'propertimes in the reciprocation of the ram orstrokes of the press.

VWith apparatus `as described the draw commences using the redraw member b2 as the plug for the draw of firstV diameter, the slides g, g1, being in position under the`v pressurefpinsb and thus taking the resistance or, pressure of theA draw and transmitting fsameto the bed a ofthe press` When the j first drawing operation is completed the bars fV flacty on said slides bythe action of the wedge members il' on the lowerinclined ffaces `h1 ofthe slots f in the slides and `,cause4 Vthelatter to recede from under the pressure pins so that the redrawl member b2 may now operate or descend under .con-

trl of its Vindividual cam. The reverse action takes place on the opposite stroke of the press, that isto say, the wedge mem- @bers act on the upper inclined acesh and y States iszslidesVarevforced back again undertlie pins, as the redraw member Z22! reaches its original position.

slight ypause ytakes place between the i sei'u'ence ofthe Voperations toiallow the slides withdrawn beforetlie second or redraw operationcommences.

' hat I clair as myA invention 'and desire to secured by Letters Patent of the YUnited l. it ldraw press, a die includi'n y tionaryY member and a plurality ofy drawing y members movable longitudinally relaltiv'eto i the stationary member and each other, a die movable toward and awayy from thestationfarya'nd drawing members andl coi-operating ktherevvith to` eli'ect a dir'awuigoperation in ,successive stages, slides mountedto have movement transversely toward each other into the path and obstruct they movement or" a drawing member and away from each other out 0ffobstrufctingposition,4 means carried by [and participating in the movement` vof the movable die co-opeiating withL said slides: to move said slides at a.' predetermined point in Vthey movement of the movable.. die in lthe drawing operation out of obstructing posi-V tion and during thev receding movement of the movable die to move said lslidesV toiand retain them in obstructing position.`

In a draw press, a die` including a lixed member and a plurality of drawing inem; bers movable longitudinally relative ,tothe fixed member and eachother, a movable die co;operating with said drawing members to effect a drawing `operation .in succeive stages, cam. mechanism operative from the movement of the movable dieto inove in unison therewith for controlling theoperation of the respective drawing. members, iiieans'slidably mountedon the press bed to have movement transversely toward each,

other into the patli'and obstruct' the move- V-iiieiit ofla drawing member and laterally out of Vobst iiicting position from said drawing member, means carried by and participating in tliemoveii'ioiit of the movable die to co*- at aprede'teiinined point in the" drawing operation o fthe movable die to move said `iiigians out.. of obstructing position and retain kiti-n such position during a portion of a successive drawing operation, and l operative at a predetermined ,pointin the` receding movesL ment of the movable 'die toinove saidmeans to vobstru'stings position .and retain 'it in such position until actuated yupon the successive drawingy operation. l i

y er 3,: Ina draw pressa die including a fixed memberand a plurality of drawing members movable longi idinallyfrelativeto the lixed member and eachother, a movable die cooperating' with said drawinginembers to efoperation in successive draw i D and redraw stage`s,'afcain `for eachdrawing member reciprocatory in unison witliftlie movable die andloperative to control the movements yofvsaid dra-wing members, and sliding members arranged to havelfmovement ,operate with said slidably mounted means transversely:toward each other into and away Y,

fromeaclinother out'of the pathov movement of a redraw member, kand bars carriedlby and participating inA the movementl of the movabledie operative duringf'the .receding ofV said pressurethrougha portionof a suc@ cessive drawing operation anduntil said lat-k ter member commences its drawing iunctioii.

4. ln a draw" press, a die comprising a `iCiXed member and c lravw and redraw men'ibersmov.- able longitudinally in relation to the fixed member and one.Y anotheig'a movable die cooperating with lsaiddrawing members to sion, and means controlled by the movement ofjtliemovable die for preventing movement of the redraw member'and to transmit thel pressure of saidmolvable die thereon to the lll) elect'ijeceding movements thereof in succespress `frame until the time ijequired for,com l,

inencement 'of operation of 'said redraw mem'- be'r, comprisin'gslides movable transversely toward each other'andinto the path of movement of and for engagement by said draw member andaway fromfeach other to be Y.

'retracted ffromsaid position, and wedge `reciprocatory movements of themovable die with inclined walls of said .slots members carried by andpai'ticipating inv the i slidable in slots in the slides and cooperating during the movement thereof. Y u

5.` In a draw press, a die'iiicluding a fixed member and a plurality of drawing members movable longitudinally of the Vfixed die and one another, a movable die co-operating with said drawing members to effect a drawing operation in successive stages, slidablefelements movable Vtoward each other transversely of the path of movement of the drawing members and to position to 'obstruct the movement of one drawing member for a definite period of thel drawing operation and then away from each other lto permit of movement of said drawing member, and wedge members carried by participating iny the reciprocatory movements of the movable die co-operating with the slidable elements to actuate thev same in timed sequence with the movement of the movable die.

6. In a draw press, reciprocatory and sta' tionary co-operating dies one of which dies has a drawing member Varranged con` centrically thereof to have movement imparted thereto relative tosaid die member through the movement of the reciprocatory die, abutment means slidably kmounted on the bed of the press to have movement trans# versely toward each other into the path of movement of and for engagement by said' drawing member to hold the same against movement during a predetermined period I ofmovement of thek reciprocatory die and to be moved toward each other out of the. path of movement of said Vdrawing member at the termination of said Vpredetermined period of movement and transmit the movement of the reciprocatory die to the terminus thereof to the drawing member and means carried by and participating in the recipi'ocatory movement of the reciprocatorydie for effecting and controlling the movement of said abutments. Y

7. In a draw press, a die including a stationaiy member and a drawing lmember movable longitudinally of the stationary member arranged concentrically thereof, a reciprocatory die movable toward and away from the first die and adapted to transmit the movement thereof to the drawing membei', means actuated-from and participating Vin the movement of the reciprocatory die and cooperating with the drawing member to control and resist the movement thereof by the reciprocatory-die, abutment means movable transversely of the movement of the drawing member toward eachother into and away from each other out of the path of movement of the drawing member and means carried by and participating in the movement of the reciprocatory die to posi= tion said abutment means for engagementof the drawing member during the initial v lmovement of thel reciprocatory die to hold the `drawing member against movement by said die, andY move the abutment means out of theppatli of movement of and release the drawing member at a predetermined point in themovement ofthe reciprocatory"die to permit the drawing member to participate in the movement of the reciprocatory die.

8. AA draw press as claimed in claim?,

wherein the abutment means movable transversely toward and away from each other into and out of the path of movement of and i for engagement by the drawing member comprises a'pair of slides slidably mounted on the lpressbed Vat yopposite sides of. .theV

longitudinal aXis thereof, and meansgcarried by and participating in the movement of the reciprocatory die co-operating with .said'slides to actuate the same.

9. A draw press as claimed in claim 7,

'wherein the abutment means movable transversely toward and awayA from each other into and out of the path of movement of and for engagement by the drawing member comprises a pair of slides slidably mounted on the Apress bed at opposite sides of the 'longitudinal vairis thereof, bars connected to andparticipating in. the Vmovementsl of the reciprocatory die arranged with cams slidably engaging in recesses yin the slides to actuate the same.V Y Y n lO. A draw press as claimed in claiin?,

"wherein-the abutment meansmovable transversely into and out of the path of movement of and for engagement vby the drawing member comprises a pair of slides slidably mounted onthe press bed at opposite sides of the longitudinal axis thereof toV have movement toward and away from each other, bars connected to and participating in the movementsof the reciprocatory die, said bars having cam portions slidably en;

gaging theslides arranged to position the f slides toward each other for obstructingthe movement of the drawing member during the receding movement of the reciprocatory dieand transmit the pressure of the reciprocatory die to the press bed during apredetermined period of the drawing operation and cam portions operative at the termination ofv said period to move the slides away l from'each other out of obstructing position and permitY the drawing member to participate in the movement ofthe reciprocatory die and retainthe slides in saidposition during the initialiportion of the receding movement of the reciprocatory die and move the plates to obstructing position during` the latter Vportion of said receding movement and when the drawing member has been returned -to rnormal position.

1l. A vdraw, press asrclaimed in claim wherein the drawing memberjis 'supportedV by slidably mounted pli-ns, andthe abutment means to hold the drawing member against movement bythe reoiprocatory die ,com-v,

at opposite sideshof the longitudinalV axis ofthe press to have movement toward andv memos away from each other andv arranged for. the engagementof said supporting pins in one position tliereoffand means carried by'and participating in the movement Yofthe reciprocatoly die to aetuate said Slides.

Y In-Witness 'Whereo1 I have signed this specification. v

V GEQRGJE WILLIAM BERRY. 

